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Shareholders' equity - Schedule of Stock by Class (Details)
€ / shares in Units, € in Millions
Dec. 31, 2025
EUR (€)
€ / shares
shares
Dec. 31, 2024
€ / shares
shares
Dec. 31, 2023
shares
Class of Stock [Line Items]      
Common stock, authorized amount | € € 126.0    
Common and treasury stock, par or stated value per share (in EUR per share) | € / shares € 0.09    
Common stock, shares, outstanding (in shares) 385,417,665 393,283,720 393,421,721
Treasury stock, par or stated value per share (in EUR per share) | € / shares € 0.09    
Number of treasury shares (in shares) 2,730,009 546,972 6,162,857
Cumulative preferred stock      
Class of Stock [Line Items]      
Cumulative preference shares; authorized (number of shares) 700,000,000    
Cumulative preference shares; nominal value (in EUR per share) | € / shares € 0.09    
Preferred stock, votes per share (in votes per share) 1    
Number of issued shares (in shares) 0    
Common stock      
Class of Stock [Line Items]      
Ordinary Shares, authorized (in shares) 700,000,000 700,000,000  
Ordinary shares, nominal value (in EUR per share) | € / shares € 0.09 € 0.09  
Common stock, votes per share (in votes per share) 1    
Common stock, shares, outstanding (in shares) 385,417,665 393,283,720  
Number of issued shares (in shares) 388,147,674 393,830,692 399,584,578